All creature cards you own with flash are instants in addition to their other types. Whenever you cast another spell with two or more card types, you may draw a card, then discard a card.
2019-11-12
If you don't draw a card, you don't discard a card.
2019-11-12
Some playtest cards have unusual type lines. To determine whether those cards have a card type not listed above, refer to that card's rulings on Gatherer.wizards.com.
2019-11-12
The card types that can normally appear on spells are artifact, creature, enchantment, instant, land, planeswalker, sorcery, and tribal. Legendary, basic, and snow are supertypes, not card types.